The series stars Georgina Sherrington and Felicity Jones (as Mildred Hubble and Ethel Hallow respectively) as well as veteran British actress Una Stubbs as the eccentric chanting teacher. Revolving around Miss Cackle's Academy for Witches, a school for magic, The Worst Witch follows the adventures of Mildred and her friends. Mildred's clumsy personality leads the girl to disastrous situations, and she is thus considered the worst student in the whole school.